I submitted my resume, cover letter, and answered some short answer questions (e.g. describe your proudest accomplishments; describe a time you had to assume a leadership position) through their online application portal. I was invited to interview a few weeks later. To help prepare for the interview, BCG offered webinars and one-on-one mock interviews with current consultants. The first-round interview day was well-organized and ran smoothly. All candidates interviewing around the same time waited together in a room where there was coffee, tea, and snacks, as well as other consultants to chat with. We were all given little notecards with bios of our two interviewers and information regarding next steps. Both of the interviews involved a set of fit questions and a case. Depending on the interviewer, the fit portion can be more conversational or feel like you are just answering a list of separate questions. Both of the cases were as expected--challenging and with a few complicated charts.